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Related Experiment Videos

Efficient on-line setup correction strategies using plan-intent functions.

Harry Keller1, David A Jaffray, Tara Rosewall

  • 1Department of Radiation Physics, Princess Margaret Hospital, Toronto, Ontario M5G 2M9, Canada. harald.keller@rmp.uhn.on.ca

Medical Physics
|June 7, 2006
PubMed
Summary
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New image-guided radiation therapy (IGRT) strategies offer better efficacy than traditional methods. Novel online setup correction strategies reduce workload and improve treatment plan compliance for prostate cancer patients.

Area of Science:

  • Radiation Oncology
  • Medical Physics

Background:

  • Image-guided radiation therapy (IGRT) systems necessitate on-line set-up correction strategies.
  • These strategies often involve high workloads due to daily corrections based on action levels.

Purpose of the Study:

  • To evaluate the trade-off between workload and efficacy of on-line set-up correction strategies.
  • To compare a fixed action level strategy with novel dose-volume histogram (DVH) constraint and equivalent uniform dose (EUD) score strategies.

Main Methods:

  • Reformulated three on-line correction strategies using score functions reflecting treatment plan intent.
  • Conducted a retrospective study on 5 prostate cancer patients using conformal radiotherapy (79.8 Gy).

Main Results:

Related Experiment Videos

  • The fixed action level strategy (3 mm) resulted in a high correction workload.
  • Novel DVH and EUD strategies demonstrated a controlled decrease in rectal and bladder dose with reduced workload.
  • Larger action levels in the fixed strategy showed a fortuitous dose benefit to organs at risk.

    • Conclusions:

    • On-line correction strategies should be assessed for both workload and efficacy.
    • Novel strategies tailored to patient anatomy and dose distribution improve compliance with treatment intent.
    • IGRT correction strategies can be optimized for individual patient needs.